Laboratory Grounding and Renovation Case Studies

Employees (operators) wearing synthetic clothing and moving around easily generate static discharges. Additionally, the friction, mixing, and movement of packaging products or周转 equipment (turnover equipment) and the air in high-temperature rooms can also produce static electricity. The static electricity can easily cause electronic components to short-circuit and burn, affecting the accuracy of detection equipment and instruments and causing computer systems to malfunction. The sparks generated by static electricity are also sufficient to ignite and explode flammable and explosive gases like natural gas, oil, and alcohol. Therefore, proper grounding is required for equipment, containers, and pipes that are prone to static electricity, as well as for production processes that generate static electricity. Grounding refers to making an electrical connection between a specific point in the system, device, or equipment and the local ground (earth). Therefore, the lower the resistance, the faster the current flows, and the higher the level (or safer) of equipment (or grade) that can be protected. Moreover, good grounding can effectively reduce static noise in computer systems caused by potential changes.

Types of grounding: working grounding, protective grounding, anti-static grounding, lightning protection grounding, multiple grounding, equipotential grounding, shielding grounding, signal grounding for electronic equipment, power grounding for electronic equipment, etc.

Based on international and domestic standards: The static grounding resistance values (earth resistance values) are categorized into three grades:

        ①.≤1Ω; ②.≤4Ω; ③.≤10Ω; 

General Requirements:

Communication Work Site: ≤4Ω

Safety Protection Ground: ≤4Ω

Anti-static grounding: ≤4Ω

Lightning Protection Grounding: ≤10Ω

The factory or laboratory can choose the appropriate grounding resistance value based on their own environmental requirements.

Recommendation: The ground resistance value for general factories can be required to be ≤10Ω (but if all equipment needs to be connected, the ground resistance value should be ≤4Ω). For example, in chemical factories (manufacturing hazardous chemicals) and factories that produce and process flammable and explosive gases, the ground resistance value should be required to be ≤4Ω or higher. For electronic factories, semiconductor factories, testing laboratories, and computer systems (cleanroom 100 or above, with electronic components with withstand voltage not exceeding 100V), the ground resistance value should be required to be ≤4Ω or higher.

Guangzhou Liying Antistatic Technology Co., Ltd. has years of experience in the construction and renovation of static grounding and indoor wiring systems. We have professional technical staff and construction teams that can provide technical references based on your production or safety environment, and suggest the appropriate resistance value for the standard level. Welcome all manufacturers and companies to inquire and place orders. Thank you!